package com.itheima.service;

import com.alibaba.dubbo.config.annotation.Reference;
import com.itheima.pojo.Permission;
import com.itheima.pojo.Role;
import com.itheima.pojo.User;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

//获取用户的信息：用户名参数 密码（在数据库中，使用用户名查询到,加密） 权限（角色keyword和权限keyword）
//后台进行认证
@Component
public class SpringSecurityUserService implements UserDetailsService {
    //使用dubbo通过网络远程调用服务提供方获取数据库中的用户信息
    //查找服务,,生成代理对象
    @Reference
    private UserService userService;

    //根据用户名查询数据库获取用户信息
    //loadUserByUsername框架自己调用
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        User user = userService.findByUsername(username);
        //判断查询是否成功
        if(user == null){
            //用户名不存在
            return null;
        }

        //创建权限集合
        List<GrantedAuthority> list = new ArrayList<>();

        //动态为当前用户授权
        //获取用户角色,,保存到set集合中
        Set<Role> roles = user.getRoles();
        for (Role role : roles) {
            //遍历角色集合，为用户授予角色 ROLE_
            //getkeyword关键字   SimpleGrantedAuthority(简单的授权)
            list.add(new SimpleGrantedAuthority(role.getKeyword()));
            //role.getPermissions();获取权限集合
            Set<Permission> permissions = role.getPermissions();
            for (Permission permission : permissions) {
                //遍历权限集合，为用户授权
                list.add(new SimpleGrantedAuthority(permission.getKeyword()));
            }
        }
        //UserDetailsService的实现类也就user  此处的密码已经进行了加密
        org.springframework.security.core.userdetails.User securityUser = new org.springframework.security.core.userdetails.User(username,user.getPassword(),list);
        return securityUser;
    }
}

